Homozygous purelines in cattle can be obtained by

(1) mating of related individuals of same breed

(2) mating of unrelated individuals of same breed

(3) mating of individuals of different breed

(4) mating of individuals of different species

Outbreeding is an important stategy of animal husbandry because it

1. help in accumulation of superior genes

2. is useful in producing purelines of animals

3. is useful in overcoming inbreeding depression 

4. exposes harmful recessive genes that are eliminated by selection

Among the following edible fishes, which one is a marine fish having rich source of omega-3 fatty acids?

(1) Mystus

(2) Mangur

(3) Mrigala

(4) Mackerel

Interspecific hybridisation is the mating of

(1) animals within same breed without having common ancestors

(2) two different related species

(3) superior males and females of different breeds

(4) more closely related individuals within same breed for 4-6 generations

Which of the following enhances or induces fusion of protoplasts?

1. Sodium chloride and potassium chloride

2. Polyethylene glycol and sodium nitrate

3. IAA and kinetin

4. IAA and gibberellins

In vitro clonal propogation in plants characterised by

1. PCR and RAPD

2. Northen blotting

3. Electrophoresis and HPLC

4. Microscopy

Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?

(1) Bacterial leaf blight of rice

(2) Downy mildew of grapes

(3) Loose smut of wheat

(4) Black rust of wheat

A system of rotating crops with legume or grass pasture to improve soil structure and

fertility is called

1. contour farming

2. strip farming

3. shifting agriculture

4. ley farming

A technique of micropropagation is

1. Somatic hybridisation

2. Somatic embryogenesis

3. Protoplast fusion

4. Embryo rescue